Sentence Case Converter

Convert text to sentence case. Automatically capitalizes the first letter of each sentence while making the rest lowercase.

Input Text

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Sentence Case Text

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Conversion Options

Examples

Original Text:

THIS IS AN EXAMPLE of text that needs sentence case. it has multiple sentences. some with incorrect capitalization. NASA is an acronym. john smith is a proper noun.

Converted to Sentence Case:

This is an example of text that needs sentence case. It has multiple sentences. Some with incorrect capitalization. Nasa is an acronym. John smith is a proper noun.

With "Preserve acronyms" and "Respect proper nouns" options enabled, "NASA" and "John Smith" would retain their original capitalization.

About Sentence Case Converter

Our free online Sentence Case Converter automatically capitalizes the first letter of each sentence in your text, while converting the rest to lowercase. It correctly handles punctuation like periods (.), question marks (?), and exclamation points (!).

This tool is essential for writers, editors, students, and anyone who needs to ensure their text follows standard English capitalization rules for sentences. Fix improperly capitalized text or convert blocks of text (like all caps) into proper sentence format instantly.

When to Use Sentence Case:

  • General writing and paragraphs
  • Email and letter content
  • Academic papers and essays
  • News articles and blog posts
  • Fixing text copied from various sources

Advanced Features:

  • Proper Noun Recognition: Option to maintain capitalization of names and places
  • Acronym Preservation: Keep acronyms like NASA, FBI, HTML in uppercase
  • Quote Handling: Preserve original capitalization within quotation marks